adding ability to pass custom options into test file
fixing typo in docs for custom params
merge master, fix conflicts
change option addition to use new convention
Merge pull request #33 from theresaanna/master

Adding ability to define arbitrary options to be passed into tests from Grunt config
CasperJS options can be passed in via grunt task. There are no restrictions now as to which options can be used.

Resolves ronaldlokers/grunt-casperjs#33